Even light can take on Birkeland current-like properties

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Even light can take on Birkeland current-like properties

Unread postby Michael Mozina » Wed Nov 08, 2017 11:55 am

https://www.seas.harvard.edu/news/2017/ ... d-of-light

The new metasurface connects two aspects of light, known as orbital angular momentum and circular polarization (or spin angular momentum). Polarization is direction along which light vibrates. In circularly polarized light, the vibration of light traces a circle. Think about orbital angular momentum and circular polarization like the motion of a planet. Circular polarization is the direction in which a planet rotates on its axis while orbital momentum describes how the planet orbits the sun.

https://www.seas.harvard.edu/sites/defa ... 20copy.gif

The fact that light can even carry orbital momentum is a relatively recent discovery — only about 25 years old — but it’s this property of light which produces strange new states, such as beams in the shape of corkscrews.


There's a very cool image of the corkscrew effect at the link provided. This should open up some interesting new research about the nature and behaviors of light.
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Re: Even light can take on Birkeland current-like properties

Unread postby seasmith » Wed Nov 08, 2017 4:22 pm

Orbital Angular Momentum of Light

The use of light/laser OAM for optical 'tweezers' and other MOEM devices is fairly common these days, but i didn't know it was also used in astronomy:
http://www.icranet.org/download/ESOP/Sl ... bieri2.pdf

Your Harvard folks have come up with a clever device for generating OAM, that is tunable by polarization, and i fully expect to see it featured on the
iPhone XI.
:D
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Re: Even light can take on Birkeland current-like properties

Unread postby celeste » Fri Dec 01, 2017 9:16 pm

Michael Mozina wrote:https://www.seas.harvard.edu/news/2017/11/strange-new-world-of-light

The new metasurface connects two aspects of light, known as orbital angular momentum and circular polarization (or spin angular momentum). Polarization is direction along which light vibrates. In circularly polarized light, the vibration of light traces a circle. Think about orbital angular momentum and circular polarization like the motion of a planet. Circular polarization is the direction in which a planet rotates on its axis while orbital momentum describes how the planet orbits the sun.

https://www.seas.harvard.edu/sites/defa ... 20copy.gif

The fact that light can even carry orbital momentum is a relatively recent discovery — only about 25 years old — but it’s this property of light which produces strange new states, such as beams in the shape of corkscrews.


There's a very cool image of the corkscrew effect at the link provided. This should open up some interesting new research about the nature and behaviors of light.


Yes, Light propagates exactly like plasma. With light, we either have spherically propagating wave fronts, or laser like beams. With plasma, we either have charged particles traveling radially towards/away from some "point source" in a spherical front, or we have Birkeland currents, which propagate as beams. That would be "Gaussian Bessel beams" to be exact. With plasma, we know it is the density of charged particles that determines whether it is a beamlike Birkeland current, or a spherical front. The key point here is that with plasma, we know it is the shear number of particles moving together that draw together into a Birkeland crrent, otherwise we have effectively single particles moving in an external field.

So what does that say about the nature of light? Again, a single charged particle, or even a small handful of particles, does not give us a Bessel distribution, We need a lot of charged particles (an effectively continuous distribution), to get a Birkeland current. Each "lobe", or "cylindrical shell"is made up of myriad charged particles.
So, the question is, can we get light to propagate as a "Gaussian Bessel beam", if a "photon" is the smallest unit?
Or do we need an effectively continuous medium on that scale too? A Birkeland current does not merely propagate through plasma; it is composed of plasma. Light too, must not merely propagate through an aether, but be composed of that aether.
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Re: Even light can take on Birkeland current-like properties

Unread postby seasmith » Sat Dec 02, 2017 5:00 am

`
Celeste wrote:

Light too, must not merely propagate through an aether, but be composed of that aether.


Or exist on a continuum with that aether, as do, most likely, gravity and elemental matter.
All four have an electrical connection.
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Re: Even light can take on Birkeland current-like properties

Unread postby Webbman » Sat Dec 02, 2017 5:05 am

its only a matter of time.
The secret to the universe is a rubber band.
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